Genetics And Plant Breeding - Study Mode
[#581] Sterility is most pronounced in F1 generation of
Correct Answer
(D) Inter specific
Explanation
Solution: Sterility is most pronounced in the F1 generation of Interspecific. An F1 hybrid is the first filial generation of offspring of distinctly different parental types. F1 hybrids are used in genetics, and in selective breeding, where the term F1 crossbreed may be used. These F1 hybrids are usually created using controlled pollination, sometimes by hand pollination, and are mostly sterile.
[#582] Ratio of the genetic variance to the total variance which determines the relationship between phenotype and genotype is known as
Correct Answer
(C) Heritability
Explanation
Solution: The ratio of the genetic variance to the total variance which determines the relationship between phenotype and genotype is known as Heritability. Heritability is a measure of the proportion of phenotypic variance attributable to genetic variance, and it is an important predictor of the degree to which a population can respond to artificial or natural selection. It is to conclude how well differences in people's genes account for differences in their traits. Traits can include characteristics such as height, eye colour, and intelligence, as well as disorders like schizophrenia and autism spectrum disorder.
[#583] Lipid protein bilayer model was proposed by
Correct Answer
(A) Danieli and Davson
Explanation
Solution: The lipid-protein bilayer model was proposed by Danieli and Davson. It was a model of the plasma membrane of a cell, proposed in 1935 by Hugh Davson and James Danielli. The model describes a phospholipid bilayer that lies between two layers of globular proteins, which are both trilaminar and lipoprotinious. The model proposed an explanation for why certain substances were not able to pass through cell membranes, while also accounting for the thinness of membranes.
[#584] Pure line variety is a
Correct Answer
(B) Homozygous-Homogenous
Explanation
Solution: Pure line variety is a Homozygous-Homogenous. Pure-line selection involves selecting and breeding progeny from superior organisms for some generations until a pure line of organisms with only the desired characteristics has been established. Genetically similar plants constitute homogenous populations. Examples of homogeneous populations are pure lines, inbred lines, F1 hybrid between two pure lines or inbred lines and progeny of a clone. A homozygous genotype may include two normal alleles or two alleles that have the same variant.
[#585] To produce 512 cells from a single partent cell how many Mitotic divison will occur?
Correct Answer
(A) 9